how to build an if statement beyond the conditions

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Muhammad Dzul Akbar 2018-8-27

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https://ww2.mathworks.cn/matlabcentral/answers/416320-how-to-build-an-if-statement-beyond-the-conditions

编辑： madhan ravi 2018-8-28

采纳的回答： madhan ravi

Hello Guys,

best wishes to all of us. I beg for help in solving this case. the case is in the form of conditioning logic.

I have to build a program line which is described in the conditions below:

suppose I have an input value in the form of a matrix Q = [0.2; 0.8; 1.4; 1.1; 2; 3; 3.9; 4.2; 5.5; 5; 4.7; 4; 3.5; 3.8; 3.1; 2.5; 1.9; 1.3; 0.7; 0], from the value of this input included in some of the conditions provided below

for input matrix Q uses looping

for example, the first loop, Q = 0.2

CONDITION A * if the value of Q <= 2 then the value of Z = 1200 * if the value of 2 <= Q <= 4 then the value of Z = 2000 * if the value of 4 <= Q <= 6 then the value of Z = 3500

so the value of Z for Q = 0.2 is Z = 1200

and from these conditions, must also meet the following conditions

CONDITION B * if the current Q value is Q value [example in row 4 matrix] then Z value = previous Z value * if the current Q value = from the previous Q value then the Z value is used by the current Z value

and then the program must also meet the following conditions:

CONDITION C * if the Z value in the loop has used the last condition Z (Z = 3500) then the Z value used for looping after that is Z = 3500 [CONDITION A, B, C NOT IN THE PROCESS]

For example in the loop line Q matrix 11 (ie for Q = 3.5) so Z used Z = 3500, not 2000

Please help me

Thanks

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Muhammad Dzul Akbar 2018-8-27

I have tried learning from books and videos from YouTube, but for CONDITION C which is an obstacle for me.

can you give me a clue?

Muhammad Dzul Akbar 2018-8-27

在 MATLAB Online 中打开

@madhan ravi

for i = 1:size(Q,1); x = Q(i,1); y = Q(i-1,1);

       K= zeros(20,1);
       if x <= 2
           K(i,1) = 1200
        elseif x > 2 & x <= 4
           K(i,1) = 2000          
        else x > 4 & x <= 6
           K(i,1) = 3500   
       end
       if x < y 
          K(i,1) = K(i-1,1)
       elseif x > y
          K(i,1)= K(i,1) 
       End
End

for condition C, i can't

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采纳的回答

madhan ravi 2018-8-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/416320-how-to-build-an-if-statement-beyond-the-conditions#answer_334236

编辑：madhan ravi 2018-8-27

在 MATLAB Online 中打开

    Q = [0.2; 0.8; 1.4; 1.1; 2; 3; 3.9; 4.2; 5.5; 5; 4.7; 4; 3.5; 3.8; 3.1; 2.5; 1.9; 1.3; 0.7; 0]
    K= zeros(20,1);
    for i = 2:size(Q);
        x(i) = Q(i);
        y(i) = Q(i-1);
           if x(i) <= 2
               K(i) = 1200;
            elseif x(i) > 2 & x(i) <= 4
               K(i) = 2000;          
           elseif x(i) > 4 & x(i) <= 6
               K(i) = 3500;
           elseif x(i) < y(i) 
              K(i) = K(i-1);
           elseif x(i)> y(i)
              K(i)= K(i);
           end
    end
    K_before = K
    for i = 1:length(K)
        if K(i)==3500
            K(i+1)=K(i);
        else
            continue
        end
    end
K_after = K